Substrate quality and the temperature sensitivity of soil organic matter decomposition

摘要: Abstract Determining the relative temperature sensitivities of decomposition different soil organic matter (SOM) pools is critical for predicting long-term impacts climate change on carbon (C) storage. Although kinetic theory suggests that sensitivity SOM should increase with substrate recalcitrance, there remains little empirical evidence to support this hypothesis. In study presented here, sub-samples from a single bulk sample were frozen and sequentially defrosted produce samples same had been incubated lengths time, up maximum 124 days. These then placed into an incubation system which allowed CO2 production be monitored constantly response respiration short-term manipulations investigated. The increased significantly time suggesting that, as most labile pool was depleted increased. This therefore one first provide theory. Further, using modelling approach, we demonstrate it more recalcitrant will determine soil-C losses. Therefore, magnitude positive feedback global warming may have underestimated in previous studies.